package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;


/**
 * @author mwj
 * @date 2021/11/22
 * @TIME:9:50
 */

// /*代表需要拦截的请求，所有请求全部拦截
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //A. 获取本次请;;求的URI
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String uri = request.getRequestURI();
        //log.info("拦截到请求：{}", uri);
        //B. 判断本次请求, 是否需要登录, 才可以访问
        //定义不需要处理的请求路径,静态文件都放行，主要拦截java下自己写的除登录操作外
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/**",

                "/doc.html",
                "/swagger-ui.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //2、判断本次请求是否需要处理
        boolean check = check(urls, uri);
        //3、如果不需要处理，则直接放行
        if (check) {
            //log.info("本次请求{}不需要处理", uri);
            filterChain.doFilter(request, response);
            return;
        }

//        if(uri.equals("/employee/login")||uri.equals("/backend/page/login/login.html")){//代表是登录请求
//            //C. 如果不需要，则直接放行
//            filterChain.doFilter(request,response);
//            return;
//        }
        //D. 判断登录状态，如果已登录，则直接放行
        HttpSession session = request.getSession();
        Long employee = (Long) session.getAttribute("employee");
        Long user = (Long) session.getAttribute("user");
        //如果已登录放行
        if (employee != null) {
            //todo 回顾理解
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request, response);
            return;
        }
        if (user != null) {
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;
        }

        //E. 如果未登录, 则返回未登录结果
        //response.sendRedirect("backend/page/login/login.html");
        //log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;


    }

    public boolean check(String[] urls, String uri) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, uri);
            if (match) {
                return true;
            }
        }
        return false;
    }


}
